4. Communications: electrical
  5. Audible indication
  6. Percussion-type sound producer

Keith Allen Engstrom

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Double depression magnetic keyswitch

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Keyboard with N-key lockout and two-key rollover protection

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Profile ID: LFUS-PAI-P-1335713

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